Article
Geosciences, Multidisciplinary
Xiaoyi Xu, Li-Yun Fu, Ning Liu, Tongcheng Han
Summary: The research team developed a DEM-DFN model for simulating the microstructure of fractured rocks, conducting numerical experiments to investigate the impact of parameters such as window radius, particle size, and crack length on coordination numbers in order to identify crack patterns.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Computer Science, Interdisciplinary Applications
A. A. Jameei, S. Pietruszczak
Summary: This study investigates the evolution and coalescence of localized damage zones in sparsely fractured crystalline rocks. A novel approach is proposed that incorporates a constitutive law with embedded discontinuity and accounts for the hydromechanical interaction in the regions intercepted by discontinuities. The results are verified through benchmark problems and further analyses are conducted to examine the hydromechanical response in the presence of multiple fractures.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Mansour Sharafisafa, Zeinab Aliabadian, Akira Sato, Luming Shen
Summary: Hydraulic fracturing is an effective technique to enhance reservoir permeability, but the pre-existing discontinuities and heterogeneities need to be considered. This study simulated the thermo-hydro-mechanical behavior of hydraulic fracturing in deep reservoirs and found that controlling factors have a significant impact on the fracturing pattern.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Feng Xiong, Chun Zhu, Gan Feng, Jun Zheng, Hao Sun
Summary: Three-dimensional fluid flow and thermal transport modeling in discrete fracture networks (DFNs) is crucial for enhanced geothermal systems (EGSs). A coupled thermo-hydro (T-H) model based on the Galerkin finite element method was developed, considering nonlinear fluid flow models and a simplified thermal transport model. The proposed method was validated using experimental, analytical, and numerical solutions, and applied to simulate heat extraction in a Habanero EGS reservoir. The results showed that injection pressure and temperature had different effects on power generation and reservoir lifespan.
Article
Environmental Sciences
Zitong Zhou, Delphine Roubinet, Daniel M. Tartakovsky
Summary: A method for inferring fracture density and fractal dimension of fractured rocks from thermal experiments data is presented. This method shows that fracture density can be well constrained by data, while fractal dimension is harder to determine. Adding nonuniform prior information related to fracture network connectivity improves the inference of fractal dimension parameter.
WATER RESOURCES RESEARCH
(2021)
Article
Energy & Fuels
Behnam Karimi-Khajelangi, Majid Noorian-Bidgoli
Summary: The study aims to investigate the effect of rock anisotropy on induced stresses around an opening in fractured rock mass. Using a combination of discrete fracture network (DFN) method to construct a geometric model and distinct element method (DEM) for stress analysis, the research reveals that irregular joints with different orientations in the model cause anisotropy in induced stress magnitudes.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Mechanics
M. Krzaczek, J. Tejchman
Summary: In this paper, a 2D numerical simulation of hydraulic fracturing process in rock specimens with a single injection slot was conducted using a unique DEM/CFD-based pore-scale THM model. The impacts of dynamic viscosity, gas phase content, and temperature difference on the initiation and propagation of hydraulic fracture were examined in-depth.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Geological
Federico Ciardo, Brice Lecampion
Summary: We investigate the problem of fluid injection at constant pressure in a 2D Discrete Fracture Network (DFN) with randomly oriented and uniformly distributed frictionally-stable fractures. We show that the hydro-mechanical response of the fractured rock mass is governed by a dimensionless parameter T associated with favourably oriented fractures. Specifically, low values of T lead to fast migration of aseismic slip from injection point due to elastic stress transfer on critically stressed fractures, while marginal pressurized conditions result in the slipping patch lagging behind the pressurized region and the percolation number affecting the medium's response.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Bo Liu, Kun He, Mei Han, Xiewen Hu, Tianwei Wu, Mingyang Wu, Guotao Ma
Summary: This study uses a 3D discrete element method to simulate the initiation and kinetics of the Xiaogangjian rockslide, finding that failure of the locking section due to high hydrostatic pressure is the main trigger. Results also show the influence of equivalent internal friction angle and density of joints on slope stability.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Construction & Building Technology
Jingqi Jia, Yun Chen, Hao Luo, Guowei Ma
Summary: This study develops a numerical method for studying non-Darcy seepage in fractured rocks around deep-buried tunnels. The proposed method is validated by comparing it with field data and analytical solutions. The results show that fractures with higher conductivity dominate the non-Darcy effect, and this effect is most significant during periods of heavy rain. Additionally, the seepage stability of the tunnel lining under different conditions is found to vary.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Tianran Ma, Lintong Jiang, Weijun Shen, Wenzhuo Cao, Chaobin Guo, Hamidreza M. Nick
Summary: Discrete fracture and matrix modeling is an important tool for understanding flow in fractured media for various geoengineering applications. This study presents a finite element framework that combines discontinuous Galerkin and continuous Galerkin finite element methods to discretize the coupled flow and geomechanics in fractured porous media. The proposed hybrid method is validated using benchmark cases and realistic fracture configurations, showing discontinuous displacement and stress on both sides of the fracture.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Environmental
Jaspreet Singh, Sarada Prasad Pradhan, Mahendra Singh, Lal Hruaikima
Summary: The existing structural discontinuities, such as faults, joints, and cleavages in rock slopes, play a crucial role in controlling the properties of the rock mass, and their presence is influenced by regional tectonic structures. The concept of damage, applied to intact rock and rock mass, refers to the degradation of their strength properties. A study conducted in the Garhwal Himalaya region revealed that damage caused by regional syncline resulted in high variability in fracture intensity and trace length away from the hinge zone.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Xiaolin Huang, Shengwen Qi, Bowen Zheng, Ning Liang, Lihui Li, Lei Xue, Songfeng Guo, Xiang Sun, Daping Tai
Summary: Laboratory tests showed that increasing weathering degree resulted in a transition of mechanical responses of crystalline rocks from approximate linearity to nonlinearity under unconfined compression, leading to weakening of macro-mechanical properties. A grain-based model using UDEC was proposed to characterize the mechanical characteristics of crystalline rocks with different weathering degrees. The compression hardening deformation of grain contacts significantly affected the macro nonlinear stress-strain relation and stress thresholds of crack closure, crack imitation, stable crack growth, and unstable crack growth.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Geological
Fengshou Zhang, Tuo Wang, Fang Liu, Ming Peng, Bate Bate, Pei Wang
Summary: This paper presents a numerical investigation of sand migration towards a wellbore in unconsolidated reservoirs. The results show that fine particles are mobilized by radial flow under an imposed hydraulic gradient, and the increase in the hydraulic gradient causes an increase in the fines production. The presence of fine particles affects the process of fines migration through two competing mechanisms.
Article
Energy & Fuels
Yaoran Wei, Yongcun Feng, Jingen Deng, Xiaorong Li
Summary: This paper proposes a coupled geomechanics and fluid flow model for evaluating borehole breakout in fractured rocks. The effects of in-situ stress, fracture density, fracture orientation, fluid dynamic viscosity, and joint strength on borehole breakout were investigated through numerical simulations. The findings provide guidance for preventing borehole breakout.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Majid Noorian-Bidgoli, Lanru Jing
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2015)
Article
Computer Science, Interdisciplinary Applications
Mahdi Hasanipanah, Majid Noorian-Bidgoli, Danial Jahed Armaghani, Hossein Khamesi
ENGINEERING WITH COMPUTERS
(2016)
Article
Construction & Building Technology
Mohammad Reza Moghaddasi, Majid Noorian-Bidgoli
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2018)
Article
Energy & Fuels
Behnam Karimi-Khajelangi, Majid Noorian-Bidgoli
Summary: The study aims to investigate the effect of rock anisotropy on induced stresses around an opening in fractured rock mass. Using a combination of discrete fracture network (DFN) method to construct a geometric model and distinct element method (DEM) for stress analysis, the research reveals that irregular joints with different orientations in the model cause anisotropy in induced stress magnitudes.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Civil
Hooman Rezaee, Majid Noorian-Bidgoli
Summary: The research conducted dynamic stability analysis on ancient underground cities in Iran, simulating the impact of earthquakes on underground spaces through time history method, showing that increasing excavation area can lead to higher dynamic displacement and acceleration, suggesting preventive actions be taken to reinforce excavations to prevent damage from earthquakes.
EARTHQUAKES AND STRUCTURES
(2022)
Proceedings Paper
Engineering, Geological
M. Noorian Bidgoli, L. Jing
ROCK ENGINEERING AND ROCK MECHANICS: STRUCTURES IN AND ON ROCK MASSES
(2014)
Article
Engineering, Geological
Majid Noorian Bidgoli, Lanru Jing
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2014)
Article
Engineering, Geological
Majid Noorian Bidgoli, Zhihong Zhao, Lanru Jing
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2013)